Because you like Louis de Pointe du Lac in Interview with the Vampire: The Vampire Chronicles

Victor Frankenstein can create life, so he's pretty awesome if he says so himself. See them in Frankenstein.

Xander Harris' life motto: laugh in the face of danger and then hide until it goes away. See them in Buffy the Vampire Slayer.

Ofelia is face-to-face with the deadliest creatures of the underworld and completely unafraid. See them in Pan's Labryinth.

Christine Daae has been secretely taking lessons from a phantom musician. It sounded less creepy in her head. See them in The Phantom of the Opera.

This barber doesn't cut hair. Sweeney Todd sends his clients down a chute to be baked into his partner-in-crime's pies. See them in Sweeney Todd: The Demon Barber of Fleet Street.

Basil Hallward is dominated, soul, brain, and power by Dorian. See them in Dorian Gray.

Sometimes being a supportive girlfriend like Ophelia doesn't work out too well. See them in Hamlet.

Although Thomas Sharpe is an English baronet, he doesn't have a Shilling to his name. He's in America to sell his invention and marry rich. See them in Crimson Peak.

Drusilla's hobbies include dolls, music, and killing people. See them in Buffy the Vampire Slayer.

Blunt but anxious, Gretchen Ross bonds most easily with those who have lived tough lives like she has. See them in Donnie Darko.

A suave manipulator, Sebastian Valmont is valiantly fighting off a developing conscience. See them in Cruel Intentions.